x1, y1, x2, y2 = map(float, input().split())
A = [x1, y1]
B = [x2, y2]
dict = sum((a - b) ** 2 for a, b in zip(A, B))
print("{:.8f}".format(dict ** 0.5))
 x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 A = [x1, y1] A [x1, y1] x1 y1 B = [x2, y2] B [x2, y2] x2 y2 dict = sum((a - b) ** 2 for a, b in zip(A, B)) dict sum((a - b) ** 2 for a, b in zip(A, B)) sum (a - b) ** 2 a - b a b 2 print("{:.8f}".format(dict ** 0.5)) print "{:.8f}".format(dict ** 0.5) "{:.8f}".format "{:.8f}" format dict ** 0.5 dict 0.5 x2, y2 = map(float, input().split()) map(float, input().split()) x2 B = [x2, y2] [x2, y2] B y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1 y2 = map(float, input().split()) map(float, input().split()) y2 A = [x1, y1] [x1, y1] A dict = sum((a - b) ** 2 for a, b in zip(A, B)) sum((a - b) ** 2 for a, b in zip(A, B)) dict
x1, y1, x2, y2 = map(float, input().split())
A = [x1, y1]
B = [x2, y2]
dict = sum((a - b) ** 2 for a, b in zip(A, B))
print("{:.8f}".format(dict ** 0.5))

